Bump axum from 0.8.3 to 0.8.4 (#193)

Bumps [axum](https://github.com/tokio-rs/axum) from 0.8.3 to 0.8.4.
- [Release notes](https://github.com/tokio-rs/axum/releases)
- [Changelog](https://github.com/tokio-rs/axum/blob/main/CHANGELOG.md)
- [Commits](tokio-rs/axum@axum-v0.8.3...axum-v0.8.4)

---
updated-dependencies:
- dependency-name: axum
  dependency-version: 0.8.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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